| ( | 55 | − | x | ) | ÷ | ( | x | − | 17 | ) | = | 150 | ÷ | ( | 1000 | − | 150 | ) |
| 方程两边同时乘以: | ( | x | − | 17 | ) | , | ( | 1000 | − | 150 | ) |
| ( | 55 | − | x | ) | ( | 1000 | − | 150 | ) | = | 150 | ( | x | − | 17 | ) |
| 55 | ( | 1000 | − | 150 | ) | − | x | ( | 1000 | − | 150 | ) | = | 150 | ( | x | − | 17 | ) |
| 55 | ( | 1000 | − | 150 | ) | − | x | ( | 1000 | − | 150 | ) | = | 150 | x | − | 150 | × | 17 |
| 55 | ( | 1000 | − | 150 | ) | − | x | ( | 1000 | − | 150 | ) | = | 150 | x | − | 2550 |
| 55 | × | 1000 | − | 55 | × | 150 | − | x | ( | 1000 | − | 150 | ) | = | 150 | x | − | 2550 |
| 55000 | − | 8250 | − | x | ( | 1000 | − | 150 | ) | = | 150 | x | − | 2550 |
| 46750 | − | x | ( | 1000 | − | 150 | ) | = | 150 | x | − | 2550 |
| 46750 | − | x | × | 1000 | + | x | × | 150 | = | 150 | x | − | 2550 |
| 46750 | − | 850 | x | = | 150 | x | − | 2550 |
| - | 850 | x | − | 150 | x | = | - | 2550 | − | 46750 |
| - | 1000 | x | = | - | 2550 | − | 46750 |
| - | 1000 | x | = | - | 49300 |
| 49300 | = | 1000 | x |
| 1000 | x | = | 49300 |
| x | = | 49300 | ÷ | 1000 |
| = | 49300 | × | 1 1000 |
| = | 493 | × | 1 10 |
| x | = | 493 10 |
| x | = | 49.3 |